CAPI-Detect: machine learning in capillaroscopy reveals new variables influencing diagnosis

Lledó-Ibáñez, Gema M. ; Sáez Comet, Luis (Universidad de Zaragoza) ; Freire Dapena, Mayka ; Mesa Navas, Miguel ; Martín Cascón, Miguel ; Guillén del Castillo, Alfredo ; Simeon, Carmen Pilar ; Martínez Robles, Elena ; Todolí Parra, José ; Varela, Diana Cristina ; Maldonado, Génesis ; Marín, Adela (Universidad de Zaragoza) ; Pérez Abad, Laura ; Aramburu, Jimena ; Vela, Laura ; Ramos Ibáñez, Eduardo ; Gracia Tello, Borja del Carmelo (Universidad de Zaragoza)

Resumen: Objectives
Nailfold videocapillaroscopy (NVC) is the gold standard for diagnosing SSc and differentiating primary from secondary RP. The CAPI-Score algorithm, designed for simplicity, classifies capillaroscopy scleroderma patterns (CSPs) using a limited number of capillary variables. This study aims to develop a more advanced machine learning (ML) model to improve CSP identification by integrating a broader range of statistical variables while minimizing examiner-related bias.
Methods
A total of 1780 capillaroscopies were randomly and blindly analysed by three to four trained observers. Consensus was defined as agreement among all but one observer (partial consensus) or unanimous agreement (full consensus). Capillaroscopies with at least partial consensus were used to train ML-based classification models using CatBoost software, incorporating 24 capillary architecture-related variables extracted via automated NVC analysis. Validation sets were employed to assess model performance.
Results
Of the 1490 capillaroscopies classified with consensus, 515 achieved full consensus. The model, evaluated on partial and full consensus datasets, achieved 0.912, 0.812 and 0.746 accuracy for distinguishing SSc from non-SSc, among SSc patterns, and between normal and non-specific patterns, respectively. When evaluated on full consensus only, accuracy improved to 0.910, 0.925 and 0.933. CAPI-Detect outperformed CAPI-Score, revealing novel capillary variables critical to ML-based classification.
CAPI-Detect, an ML-based model, provides an unbiased, quantitative analysis of capillary structure, shape, size and density, significantly improving capillaroscopic pattern identification.

Idioma: Inglés

DOI: 10.1093/rheumatology/keaf073

Año: 2025

Publicado en: Rheumatology (Oxford) (2025), keaf073 [9 pp.]
ISSN: 1462-0324

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Area Medicina (Dpto. Medicina, Psiqu. y Derm.)